I'm willing to take the other side of that bet. Quoting this article [1]:

> The idea that new code is better than old is patently absurd. Old code has been used. It has been tested. Lots of bugs have been found, and they’ve been fixed. There’s nothing wrong with it.

LibreOffice has to be feature-per-feature, bug-per-bug compatible with a poorly-documented office suite that's been around for 35 years, so it's no surprise that they don't always get it right. I don't see a new office suite doing any better, unless they decide that compatibility with MS Word is no longer a priority.

[1] https://www.joelonsoftware.com/2000/04/06/things-you-should-...